In your example yes, but look at the example I posted before. Log reveals the whole pattern whereas power only shows the very strong frontal cluster.
Yes that's fine.
Well... since panning doesn't really work, it didn't really help.
This isn't the case when expanding the scale.
The simple thing I was trying to do is to be able to zoom in on low frequencies (below the filter drop) and see it expanded to the whole y-scale. For now this is what happens:
Full spectrum
Zoom x (ok)
Zoom y 
"Pan" down 
Thanks for the code pointer. I'll add this to my to-do list. 